Does Activities.Marriott not accept payment
 

Is anyone able to confirm whether activities.marriott accepts payment by non-US credit cards?
I thought it would be a good avenue to keep my account active but they don't have an address field on the payment page and the credit cards numbers are constantly rejected (regardless of which card).

The T&Cs don't specify that you must be a US resident, but is there a hidden requirement or is the webpage just broken? Any workarounds??